Improved slides for extension-tables



lnitrh tta'trs #f5-stent iifire,

Niouotts JENKINS, or' New' Youn, N. Y., assieNo-B. fro .-HIMSELF, encuen-BROWN, AND ouaiitnsrfmss, or sinn PLAGE.

Letters Patent No. 75,022, dated M'arch 3, 1868; antcdated Feruarg/ 20, 1868.

IMPROVD SLIDES FOR EXTENSION-TABLES.

TO lALL WHOM IT MAY GONCERN:

Be it known that I, NICHOLAS JENKINS, of the city andcounty of New Yorln, and State of New York, have invented certain new and useful Improvements in Slides for Extension-Tables; and Ido hereby declare that the following is a full and exact description thereof.

The general construction and arrangement of the several 4parts og the table arcridentical'with that in common use. Y I

Myinvent-ion relates to the parts which connectthc severalvscctions of the slides, and which control and modify their motions. It cheapens the construction, and increases the durability. A

I will first describe what I consider the host means of' carrying out my invention, and will afterwards designate the points which I believe to be new.

The accompanying drawings form a part of this specification.

i Figurel is a vertical section ofa table provided with my improved slides, the sectionv heing on the line S S in gfZ. I i i Figure 2 is a. 'view of` the table from helow.

Figure 3 represents some ot' the parts inthe position which they assume when the table is/fully extended. -The succeedinggures represent some of the details on a larger scale.

Figure 4 is a side view of one of the slides.

Figure 5 is an end view of several of the slides.

- Figure 6 represents the other ends of a portion of the same.

Similar. letters of reference indicate like parts in all the figures. The tints are employed to aid in distinguishing parts, and do notimply a necessary diierence of material. u

A, B, C, D, and E are the several slides.l on one side, and a, Z1, c, d, and e are the correspon-ding slides on the opposite side. The slides A and a are fast to one end of the table, and the slides E and e are fast to the -other end. The centre leg is secured as usual, and the centrally-intermediate slides C and c, and the brackets orcross-pieccs by which the vslides are connected to thc end-pieces of the table, are arranged inthe ordinary approved manner; and the table is'extendcd and contracted bya movement similar to that of ordinary extensiontables. The several slides are connected together, and made to work in contact each with the other, by

means of a thin plate ot' metal on each, which is locked within th groove in the'adjace'nt slide, with liberty to, r traverse endwise, but not in anyother direction. My plates, for this purpose, are circular, as represented hy-l M in iig. 4, and they are secured by a screw, which passes through the centre, so that they may become lo'ose, and turn around to any extent, without occupying any greater vert-ical.space in thc groove.

The rectangular plates heretofore employed involve a. liability to project upward and downward totoo great, nn extent, by becoming turned sov as to presenttheir corners upward and downward; and these corners plough,

into the wood ori-groove in which -they run, thus preventing the slides from performing their mission as'slideS,.

while mine are not so liable to he turned, having no corners; and if, vhy any means, the screw fastening'the' plate should loosen, as has been known, mine would ride .and roll in the groove like a wagon-wheel, while'the` other wouldplough into the wood and become fast. The remedy which hasheen attempted for this evil in'. the old formrof plates, by. employing two or more screws-as faste'nings, has involved an increase-of expense, with no corresponding advantage.

The blocks G, ittedy in the grooves, iorm the stops, in the ordinary manner, which guide the slides, and

sustain them vertically, and arrest the motion ofthe slides, one upon another, in the act of extending the table,

and prevent the several slides'fr'om movinigvtoo far upon each other.

'The stop-pins N are provided in thy-slides as a means f arresting the motion in the act of closing the table together. These pins strike the blocks Gr, when the adjacent slides have Abeen slid tgether to a proper extent They arrest the motion of the slides by"`a more direct application of the strain than in the ordinary arrangement, with less tendency to twist, and with less tendency to induce any lateral strain, so as to cause any of the parts] to bind.

Instead of placing the pins at or very near the end of each slide, which would give them but a. slight hold on the wood, I' set them a suil'icient distance inward upon the wood to afford a iirm'hold, and groove the block` G, which is to receivethem, in the manner indicated by Hin figs. 4 and 5. In collapsing the table, or reducing it to its non-extended condition, the several pins N enter and traverse the several short grooves H until they reach-and strike fair against the ends of these grooves, or strike against the plates M, to the edges of which the grooves Hextend. l l' When, for any reason, it is desired to get a'longer bearing on the slides than my round plate will afford, I can employ two of them side by side.

Some o f the advantages dueto certain features of my invention may beseparately enun'ieratedas follows: First. By reason of' the fact that my slide-plates M are circular, and mounted concentrically, I amable to secure them reliably by a single stout screw, or other fastening, with little expense, cither for labor or material,

`and in a manner 'which renders it 'impossible to obstruct the 'motion of' theslide by a mere loosening of the i plate, and in a manner which involves 'lessfriction than wood plates, and no possibility of shrinking and swelling, so common in all extension-tables with wooden stops and plates:

Second. By `reason 'oithe fact that each stop N is mounted in the'lgroov'cs on one part, and strikes against apart which is in the grooves-inV the adjacent part, I arrest themotion of the one slide upon the other by causing the force to act in or neel-"the plane of the strain, and consequently it induces little or no side strain, while the '.ordinary arrangement induces much side strain; The stops are also less in the Way of the other parts of the table, and interfere less with' the compactness and symmetry of the Worlr, and allow the manufacture of the slides to be conducted independent of theother parts of the table with more safety and certainty.

, Third. By reason of the fact that each stop N traverses in the short grooves'H in the adjacent: slide, or in the block fixed thereon, as represented,` I ain able to secure the full travel of the slides without sacrificing the advantage due to the central-position of the stop, as above explained, and dmvable to place the stop at a suli'- Vcient distance from the end of. the slide tov afford a proper strength'to the parts witlran arrangement of mechanism/,which is very simple andV very easily prodlced by machinery.

'Having now fully described my invention, what I claim as new in `the slides of extensiointahles, and desire to secure hy Letters Patent is `as follows :y 'Y

' 1. I claim the circular form of the metal plate'M, when arrangcllrela-tirely to the slides A, B, &c., and to the concentric fastening which secures it, substantially in' the manner and for the purpose herein set forth. A

' 2. I claiznpthe stop N, centrally arranged relatively Vto the slides A, B, dto., with the blocks G receiving the same, substantially i-n the manner and for the purpose herein set forth.

NICHOLAS JENKINS.

, Witnesses:

` D.' L. FREEBQRN,

1W. C. Der. 

